Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaef5fc0aa2b58a8…

MALICIOUS

PDF

69.4 KB Created: 2020-11-09 19:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 085a9ebe987d04355e471000c961dce7 SHA-1: 1c23696751b93b0d6705073d5c0c7bd85d229602 SHA-256: aaef5fc0aa2b58a8cf7a6787ea451e3987af1ef5f7294738e0f292741332f1af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic indicating a PDF link farm. The document contains numerous external URLs, including one that appears to be a lure for a 'survival guide'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/123?keyword=the+infp+survival+guide PDF link annotation
    • https://pufibifisap.weebly.com/uploads/1/3/4/4/134450659/nazer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8932cb40f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5fa73cb9b9b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f984987da11a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f8bc1474b0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fa32c574cec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f8bf6224729e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_5f973478e82b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f87030fc3a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f97027d0ecb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5fa501bb2c827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f997b348e77f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajuse/mabinogi_dual_gun_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 5312 bytes
SHA-256: 96784330a9c6c9ad399c9dca9d68eab5604ed5190f428f771563207435016bd7
font_01_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 10584 bytes
SHA-256: 0d70225f05835e1396f5049691e823337aea4b513b3f28cc4c4aba9a93683bea

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